Joint Venture and Consortium Arrangements - Summarized Balance Sheet Information for Consolidated Joint Venture (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Current assets	$ 6,241	$ 3,555
Total assets	8,300	8,737
Current liabilities	5,885	9,444
Variable Interest Entities ("VIEs") [Member]
Variable Interest Entity [Line Items]
Current assets	42	39
Non-current assets	16	16
Total assets	58	55
Current liabilities	$ 109	$ 120